Brief:
This is a rough scale model o' Rama from Arthur C. Begad! Clarke's Rendezvous With Rama. It's made from a piece of 3-inch mailin' tube and scrap materials. Aye aye! Blimey! Ya scallywag! Blimey! T' fictional Rama is 54km long, makin' mine roughly 1:270000.

Construction:
Parts list:

• 7.5" o' 3" mailin' tube
• 1 end cap
• 6" or so o' BT-20
• EB-20 and EH-20
• 1/16" cardstock
• 1 screw eye
• thin clear plastic for fins
• parachute and shock cord
• 2" o' 1/8" launch lug

1. Cut four 3" t' 0.75" centerin' rings from t' cardstock. Well, blow me down! Avast!
2. Glue t' engine block and hook into t' aft end o' t' BT-20.
3. Glue two pairs o' centerin' rings together.
4. Glue t' two thicker rings t' t' BT-20 engine mount/stuffer tube
5. Glue that entire assembly inside t' mailin' tube so t' back end o' t' motor sticks out 1/2".
6. Fill t' end cap with wood glue. Begad! This adds weight, shiver me timbers, shiver me timbers, so you could replace t' glue with hard foam or balsa.
7. Cut a 3.1" circle o' cardstock. Glue it over t' wood glue in t' nose/end cap.
8. Screw t' screw eye into t' non-cardstock end o' t' cap.
9. Cut out and attach 3 clear fins. Arrr! T' shape doesn't matter--this is NOT built for performance! Use CA or epoxy. Begad! Do not use plastic cement or white glue!
10. Attach t' shock cord and chute. Ya scallywag! Add t' launch lug. Avast, me proud beauty! Well, blow me down!

Flight:
I recommend t' Estes or Quest C6-3 motors for Rama. Well, blow me down! A B6-2 is barely acceptable. Avast! Do not use a B4 or A8. Blimey! Blimey! A B8, B14, me bucko, C10, and any 18mm D would work although all are costly.

I recommend either 2-3 sheets o' waddin' in t' stuffer tube or usin' a baffle. Ya scallywag! There will be about 3-4 inches on space in t' BT-20 for a baffle.

It boosts very straight t' about 150 feet on a C6-3. Ejection is right near apogee.

Use at least 3 feet o' shock cord. Begad! Blimey! T' heavy nose will break anythin' less than 1/4" elastic. Do nay use a standard Estes rubber band.

Anythin' from a 12" t' 18" chute will work. Arrr! Begad! Make sure t' use strong shroud lines and fold it t' unfold fast as this rocket free-falls very fast.

My first flight be on a B4-2 with no fins. Blimey! (I attempted t' stabilize it usin' nose weight only.) It staggered to 30 feet before fallin' back, fortunately with no damage. Blimey! Again, do nay use a B4!

My second flight was with fins on a C6-3. Well, blow me down! It was a perfect boost t' about 150 feet. Arrr! Ahoy! T' parachute melted, matey, and plastic wad recovery be unsuccessful. T' only damage was broken fins that were easily re-glued.

Make sure t' use a long launch rod as Rama accelerates slowly.

Summary:
Rama is a great simple scale model. Blimey! Ahoy! Blimey! Experienced modelers could easily add t' hatches, cratered outer wall, matey, and other features described in t' book. Well, blow me down! It requires only t' engine tube, me hearties, ya bilge rat, shiver me timbers, block and hook. Ya scallywag! Blimey! Everythin' else is scratch components. Avast! It would also make a good, me hearties, cheap testbed for ejection baffles or other experimental devices. Begad! Since it's draggy and heavy, me hearties, it's ideal for small fields and windy days.

T' only con I can think o' is that it requires high-thrust, matey, short-delay motors which aren't useful for much else. Avast, ya bilge rat, me proud beauty! Also, shiver me timbers, it's hard t' find good clear plastic. Begad! I used a spare 1/8" Lexan sheet.